Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac052de3d7162c30…

MALICIOUS

PDF

68.8 KB Created: 2021-09-18 14:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f02e448faf71907d0afb7a5fd6ffabcc SHA-1: 3b94532201fa00c8f809d54387311368891e5d2d SHA-256: ac052de3d7162c30e876ca2a8f044d158e6c5feb11ad75e3e9507ecb40a0bbfc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using low-reputation domains for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=super+mario+bros+z+flash+game PDF link annotation
    • http://medeeatour.ro/mm/file/94476933982.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/86260874386.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/60db01e99540e0ff27fdbc289508551c/45180172269.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/59355194499.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/nasanuxitozetevoruvosa.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/babavivilaxu.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/33146833716.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/viwoxunazododusaxobupefot.pdfIn PDF document text
    • http://etre-belle.su/images/file/dadafubavolalamujijuvevi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/92500848647.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/jezetimisutometo.pdfIn PDF document text
    • http://rhondachem.com/d/files/wunewimawul.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/farokenivufevesiros.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/gefupavedenoza.pdfIn PDF document text
    • https://termoformat.md/img/files/lepizatixapafa.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/bibizasek.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/159c911db0958d0d65739753bf8927d0/turofezorunipirutugifese.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/34098468701.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/93261373675.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/45828555821.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/9231960459.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/juxufutowinedimamano.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAC 10980 bytes
SHA-256: ab187b3609bd8d17a85d540cc6fd6b53385607460e80553094a95ac81e205d82
font_01_sfnt_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 15616 bytes
SHA-256: 2cd382014773bdebb56c9413fe72fcb56595c28aa6ba569806825a6e912dbdac

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